And she keeps making sure that name is hers.
It was cooler than it's been in Melbourne recently, with the temperature down below 20 degrees celsius and a breeze that made serve tosses difficult for both players, who would catch the ball instead of hit it and say, "Sorry!"
Only two active women own more Slam titles than Osaka: Williams, with 23, and her sister, Venus, with seven.
Next task for Osaka is improving on clay and grass: She's never been past the third round at the French Open or Wimbledon.
On Saturday, the final was locked at 4-4, when Brady used an on-the-run lob winner that she punctuated by waving her arms to request more noise from the crowd. That earned a break point — convert that, and she would serve for the opening set.
But Osaka erased the chance with a cross-court forehand winner, and two errors by Brady made it 5-4. Osaka then broke to grab the set, helped by Brady's double-fault and a netted forehand on a short ball to end it.
That was part of the six-game run that put Osaka ahead 4-0 in the second and she was on her way.
In the men's final Sunday, No 1 Novak Djokovic will be seeking his ninth Australian Open championship and 18th Grand Slam trophy overall. He faces No 4 Daniil Medvedev, who carries a 20-match winning streak into his second major final.
- AP